Do All Animals Have Hearts?

Answer

All animals have hearts; the only difference is that their hearts are different in structures. For instance, the mammalian heart is four chambered, the reptile and amphibian heart is three chambered, and that of fish is two chambered.
Q&A Related to "Do All Animals Have Hearts?"
4 chambers.
http://wiki.answers.com/Q/How_many_heart_chambers_...
Unicellular animals and jellyfish do not have hearts.
http://www.chacha.com/question/which-animals-have-...
The Zune's rating system is a very simple one. An outlined heart, which appears only if your mouse cursor hovers over the heart column between song length and sync status in the Zune
http://www.ehow.com/info_8238888_do-songs-zune-hea...
This article. http://oreilly.com/news/l. ejeune_ talks about the history of why O'Reilly has animals on the covers of (most of) their books, and no, the author doesn't get any say
http://www.quora.com/Why-do-all-the-OReilly-books-...
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